Theoretical Calculation of Cosmic-Ray Solar Semi-Diurnal Variation -Nucleonic Component

概要

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Theoretical calculations of the solar semi-diurnal variation expected at 41 stations for the nucleonic component have been made for two types of spectra, the power- and exponential-type. The latitude distribution of the semi-diurnal anisotropy has also been considered of both forms of the cosine- and the square of the cosine-function of the geographic latitude. Calculated results for four cases of the combination of these spectral and latitude dependences are compared. It is found that a difference in the results for the two types of the latitude distribution is appreciably large, particularly in the amplitude at high and very high latitude stations. A tendency is also shown in comparison of the results for the two types of spectral dependences that the calculated values with some higher cut-off rigidity in the power-type spectrum rather corresponds to the values with the rigidity giving the peak intensity in the exponential-type spectrum. Finally the expected relative amplitude and average deflection angle are tabulated for the case where the spectral form is of the exponential-type of R^γexp(-R/R_0) and the latitude distribution has a form of (√3)/2cos^2λ.
信州大学理学部の論文
1970-10-05